Center support for detector bars



Oct. 29, 1940.

\ c. D. BROWN CENTER SUPPORT FOR DETECTOR BARS Filed May 22, 1940 INVENTOR. 6454 D. BEoW/V.

ATTORNEY.

Patented Oct. 29; 1940 PATENT OFFICE 2,220,011 CENTER SUPPORT FOR DETECTOR BARS Carl D; Brown, Hopedale, Mass, assignor to Draper Corporation, Hopedale, Mass, a corporation of. Maine Application May 22, 1940, Serial N0. 336,613

1 I 6 Claims.

The present invention pertains to warp stop mechanisms for looms and more particularly relates to a center support and clamp for the detector bars of such warp stop mechanisms.

.1 Warp stop mechanisms of the type to which my invention applies commonly include a front warp support bar, a back warp support bar, a plurality of separator bars and a plurality of parallel detector bars. All of these bars extend widthwise lb of the loom across the warp sheet. The detector bars are located within slots or openings in drop wires. In such looms the detector bars, the separator bars, the front warp support bar and the 1. back warp support bar are supported at their ends by suitable end supporting brackets fixed to the loom frame. In addition to the end supporting brackets it is usual to provide the loom with one or more brackets as may be required to prem vent the detector bars from spreading or sagging.

2 To this end the brackets are usually provided with slots into which the lower portion of the detector bars project. Normally the bottom of the bars contact with the bottom of the slots, but there is usually a clearance between the sides of the bars and the sides of the slots. When the loom is in operation the detector bars vibrate continually with the result that both the bars and brackets are subjected to excessive wear necessitating frequent replacement.

The principal object of this invention is to provide in a warp stop mechanism for a loom having a front warp support bar, a rear warp support bar and a plurality of detector bars, a center bracket V for supporting and clamping the detector bars intermediate their ends, said bracket being detachably secured to. the front and rear warp support bars and having a plurality of slots along its top edge for receiving the detector bars and also having resilient means projecting. intoeach slot for 40' clamping the detector bar therein to prevent vibration. of said bar.

The foregoing and other objects of the invention are accomplished in the construction illustrated on the accompanying drawing, of which: is Fig- 1 is a plan view of parts of a warp stop mechanism including the preferred embodiment of my improved bracket; and

Fig. 2 is a view in elevation and partly in section of the warp stop mechanism shown on Fig. 1.

50 The warp stop mechanism with which my improved bracket is used may be either of the electric type such as disclosed in Patent No. 2,160,718 granted to Carl D. Brown on May 30,

1939, or of the mechanical type such as disclosed 55 in Patent No. 1,719,262 granted to C. H. Draper on July 2, 1929. It is obvious, as will hereinafter appear, that my improved bracket is adapted to support the detector bars of the electrical type of warp stop motion equally as well as it is adapted to support the detector bar of the mechanical type of warp stop motion. 1

The particular warp stop mechanism shown on the drawing is of the mechanical type and includes a front warp support bar I, a back warp support bar 2, separator bars 3, toothedrecipro- 0 eating detector bars 4, toothed stationary detector bars 5 and drop wires 6. All. of the forenamed members are old and well-known in the art. The front warp support bar, rear warp support bar, separator bars and detector bars extend widthwise of the loom and are supported at their ends by suitable end supporting brackets, not shown.

The particular stop motion shown is of socalled four-bank construction in that it has four pairs of parallel detector bars for receiving four 2 rows of drop wires 6. Each of the drop wires is a sheet metal device having a slot 1 for receiving one pair of detector bars and an opening 8 for receiving a 'warp thread. The drop wires operate in the usual manner in that each drop wire is normally supported by a warp thread but falls and engages the toothed detector bars when the warp breaks, whereupon the detector bars through mechanism not shown stops the loom. Each of the fixed detector bars 5 may be slotted longitudinally, as usual, for the reception of a transversely movable bar 4.

Due to the thinness of the detector bars they have a tendency to sag, separate and vibrate excessively upon operation of the loom, unless supported intermediate their ends. To prevent these defects I provide a center support bracket. Such a bracket may comprise a stamped flat sheet 9 of metal or other resilient material, substantially rectangular in shape.

Sheet 9 may be provided with an integral stamped out hook 10' at its lower forward end for hooking over the front warp support bar I. Sheet 9 at its rear lower end is secured to a bracket 10 by some suitable means such as rivets I I. Bracket I0 is detachably secured to the back warp support 2 by some suitable means such as bolt and nut I2. 11?

A plurality of inwardly projecting slots I3 are stamped out along the bottom edge of sheet 9. 5o Slots 13 are provided for the reception of separator bars 3.

A plurality of inwardly projecting slots M are stamped out along the upper edge of sheet 9. Each of slots l4 receives and supports a pair of detector bars 4 and 5. To prevent vibration of the detector bars in slots l4 suitable means may be provided, such as spaced resilient tongues l5 and I6, preferably formedintegral with sheet 9 and in the same plane therewith. Tongues l5 and I 6 are preferably formed by being stamped out from sheet 9.

Tongues l5 project from the upper forward walls of ,slots I4 rearwardly and downwardly, tongues [6 project from the bottom forward walls of slots l4 upwardly and rearwardly. The inner free ends I! and I8 of these tongues press against the detector bars 5 with a yielding pressure and hold them against the back walls of slots I4 whereby vibration of the detector bars is pre vented.

It should be noted that the warp stop mechanism is adapted to be reversed on the loom and that While warp support bar I has been called the front warp support bar and warp support bar 2 has been called the back warp support bar, such terminology has been used merely to distinguish between the two bars.

Having "thus fully disclosed the preferred embodiment of my invention, I claim:

1. In a warp stop mechanism for looms, the combination of detector'bars, a front warp support bar, a back warp support bar and a member for supporting and clamping said detector bars intermediate the ends thereof, said member comprising a stamped metal sheet having a plurality of inwardly projecting slots along its upper edge for the reception of said detector bars and also having an integral hook at its forward end for engaging said front warp support bar and means at its rear end for detachably securing it to said back warp support bar, and resilient means in each of said slots for clamping the detector bar therein to prevent vibration of said bar, each of said resilient means comprising a pair of oppositely disposed resilient tongues integral with and stamped out of said metal sheet and projecting from one of the walls of one of said slots toward the other wall thereof.

'2. In a warp stop mechanism for looms, the combination of detector bars, a front warp support bar, a back warp support bar and a member for supporting and clamping said detector bars intermediate the ends thereof, said member comprising a'flat metal sheet having a plurality of inwardlyprojecting slots stamped out along its upper edge for the reception of said detector bars and also having means at its forward end for engaging said front warp support bar and means at its rear end for detachably securing it to said back warp support bar,resilient means in each of said slots for'clamping the detector bar therein, said resilient means including a resilient tongue integral with and projecting from one wall of each of the slots toward the other wall thereof, the free end of each said resilient tongue pressing against a detector bar to prevent vibration of said bar.

3; In a loom, the combination with warp stop mechanism including aplurality of pairs of detector bars, one bar of each pair being substantially U-shaped in cross section and forming a guideway for the reception of the other bar of the pair, and front and rear warp support bars, of a center support bracket for supporting and clampingsaid detector bars, said bracket extending transversely of said front and rear warp support bars and being detachably secured thereto intermediate the ends thereof, said bracket comprising a flat metal sheet having a plurality of inwardly projecting slots'stamped'out along its upper edge, each of said slots receiving and supporting one of said pairs of detector bars, and resilient means in each slot for clamping the U- shaped detector bar therein, each of said resilient means comprising a pair of resilient tongues stamped out of said metal sheet, one of said tongues projecting from the upper forward wall of said slot rearwardly and downwardly, the other of said tongues projecting from the bottom forward wall of said slot rearwardly and upwardly, the inner free ends of said tongue pressing said U-shaped detector bar against the rear wall of said' slot whereby vibration of said detector bars is prevented.

4. A center support and clamp for supporting the detector bars of a warp stop mechanism comprising a flat sheet of resilient material having a plurality of inwardly projecting slots stamped out along its upper edge, each of said slots having a-front and rear wall, a resilient tongue in each of said slots, said tongue being stamped out from said sheet and projecting from one of said walls of said slot toward the other wall thereof, the free end of said tongue being adapted to press a detector bar supported in said slot against the rear wall of said slot whereby vibration of said bar is prevented, said sheet and said tongues being integral and in a single plane.

5. A center support and clamp for supporting the detector bars of a warp stop mechanism, said clamp comprising a fiat sheet of resilient material having a plurality of inwardly projecting slots stamped out along its upper edge, and resilient means located in each of said slots for clamping a detector bar therein, said resilient means comprising a resilient tongue integral with and stamped out from said sheet.

6. A center support and clamp for supporting the detector bars of a warp stop mechanism, said clamp comprising a flat sheet of resilient material having a plurality of inwardly projecting slots along its upper edge, resilient means in each of said slots for clamping a detector bar therein, said resilient means comprising a pair of spaced resilient tongues stamped out of and integral with said sheet, one of said tongues projecting downwardly and rearwardly from the upper forward wall of said slot, the other of said tongues projecting upwardly and rearwardly from the bottom forward wall of said slot, the free ends of said tongues being adapted to press against a detector bar in said slot to thereby prevent vibration of said bar, said'tongues and said sheet being in a single plane.

C'ARL D. BROWN. 

